Gas burner



June 10, 1958 J. v. THOMAS GAS BURNER Filed April 12, 1954 822mg l.||..", mm mw wN N NM NM nn l 1/! w o. w- 3 mm mm 7 m on JOHN V. 77/01/95,

INVENTOR.

United States Patent GAS BURNER Ziohn V. Thomas, Pasadena, Calif. Application April 12, 1954, Serial No. 422,468 4 Claims. (Cl. 158-119) This invention relates to an improved gas burner.

It is an object of this invention to provide adevice for injection of a mixture of fuel and air under pressure into a combustion chamber of a boiler or the like.

, It is a further object of this invention to inject such fuel and air mixture'into a combustionchamber in the presence of secondary air.

It is a still a further object of this invention to provide pressure responsive means controlling the direction of flow of fuel and air mixture and secondary air into the boiler.

It is still a further object of this invention to provide means responsive to fuel pressure to control the size of the outlet for fuel and air mixture and for secondary air entering the combustion chamber and consequently, the volume and velocity.

'Other objects and advantages will be readily apparent from the following description:

In the drawings: a

Figure 1 is a side elevation partially in section of a device embdoying this invention.

Figure 2 is a section taken along line 22 of Figure 1.

Figure 3 is a fragmentary sectional view illustrating the bafile in the fully open position.

Gas under pressure is supplied through line to a suitable nozzle 12. The nozzle 12 is supported in bracket 14 and discharges into tube 16. The tube 16 is flared as at 18 adjacent the nozzle and has the opposite extremity 20 flared to provide a shorter wider flame. Thus as gas is injected into a primary air chamber 13 between nozzle 12 and flared end 18 of tube 16 air is drawn into the tube and mixed with the fuel so that an air fuel mixture is discharged from extremity 20.-

Tube 16 projects through a rectangular casing which terminates inside the combustion chamber. As the fuel air mixture is discharged from tube 16 secondary air is drawn around tube 16 and enters the combustion chamber providing further oxygen for the burning of the fuel. Pivotally mounted on the upper edge of extremity 20 of tube 16 is a baflle or deflector 24. In this embodiment the extremity 20 is slotted and a pin 26 mounted therein which projects through suitable apertures in ears 28 of the bafile.

The baffle is slotted as at 30 and a pair of ears 32 are positioned on either side of the slot which receive pin 34 which in turn passes through a suitable aperture in head 36 of actuating arm 38. Thus movement of arm 38 back and forth in casing 22 pivots baffle 24.

The baffle as best seen in Figure 2 terminates when in the fully closed position at its upper edge adjacent the upper surface of casing 22. Its width is slightly greater than that of flared extremity 20 of tube 16. The lower edge of baffle 24 terminates a short distance above the lower edge of flared extremity 20 of tube 16 so that the bafiie will never completely shut off flow of fuel and air mixture into the boiler.

The positioning of actuating arm 38 and hence baflle 24 is controlled by the pressure of the gas. Thus line Patented June 10, 1958 10 is provided with a branch 40 leading into a housing 42 which is divided in half by a diaphragm 44. Diaphragm 44 is preferably of a resilient material which is unaffected by the gas.

The diaphragm 44 is urged by a spring 46 towards the nozzle 12 and actuating arm 38 is connected to the diaphragm. Thus as gas pressure is increased, the urging of spring 46 is overcome and arm 38 is drawn to the left in Figure l pivoting the batfle counterclockwise further opening the discharge extremity 20 of tube 16 and further opening the secondary air inlet surrounding tube 16. The spring pressure is adjustable by rotation of bolt 48 against which spring 46 bears.

In operation gas under pressure enters line 10 and is sprayed out nozzle 12. The gas also passes through branch 40 and into the chamber within housing 42. The pressure on diaphragm 44 acting against the urging of spring 46 positions actuating arm 38 and hence baflie 24. At relatively low pressures the baflie assumes a position similar to that in Figure 1 with the discharge extremity 20 of tube 16 substantially reduced. Fuel through nozzle 12 draws .air with it from primary chamber 13 through tube 16 and is discharged in a downwardly direction as denoted by the upper arrow in Figure 1. Similarly, the baffle in this position obstructs a substantial portion of the area around tube 16 cutting down the amount of secondary air drawn into the boiler by the discharge of gas and air mixture through tube 16.

As the gas pressure increases on diaphragm 44 the actuating arm is drawn to the left in Figure 1, further pivoting baffle 24 counterclockwise. With the gas pressure relatively high the baflie is pivoted to the position seen in Figure 3 no longer obstructing flow through tube 16.

While what hereinbefore has been described is the preferred embodiment of this invention, it is readily apparent that alterations and modifications can be resorted to without departing from the scope of this invention and such alterations and modificationsare intended to be included within the scope of this invention.

I claim:

1. In a gas burner, the combination of: a gas nozzle, a line for supplying gas under pressure to said nozzle, a member receiving gas from said nozzle and having a discharge opening through which gas and air pass, a casing surrounding said member and spaced therefrom and having an open end for secondary air, the discharge opening of said member being positioned closely adjacent said open end of the casing, a deflector adjacent said discharge opening having a pivotal axis disposed transversely of said member at one side thereof, said deflector including a first portion adapted to restrict flow through the discharge opening and a second portion adapted to restrict flow through the open end of the casing, a rod pivotally connected to said deflector, and gas pressure responsive means for actuating the rod whereby an increase in gas pressure in said line acts to tilt the de flector in a direction to reduce the restricting effect on both the discharge opening and the open end of the casing.

2. In a gas burner, the combination of: a gas nozzle, a line for supplying gas under pressure to said nozzle, a horizontal member receiving gas from said nozzle and having a discharge opening through which gas and air pass, a horizontal casing surrounding said member and spaced therefrom and having an open end for secondary air, the discharge opening of said member being positioned closely adjacent said open end of the casing, a deflector pivoted on the member about an axis disposed transversely of said member, said deflector including a first portion adapted to restrict flow through the discharge opening and a second portion adapted to restrict flow a: through the open end of the casing, a rod pivotally connected to said deflector, and gas pressure responsive means for actuating the rod whereby an increase in gas pressure in said line acts to tilt the deflector toward a substantialy horizontal position.

3. In a gas burner, the combination of: a gas nozzle, a line for supplying gas under pressure to said nozzle, a mixer tube receiving gas from said nozzle and receiving atmospheric air, said tube having a discharge opening through which gas and air pass, a casing surrounding said mixer tube and spaced therefrom to define a passageway for secondary air, said casing having an open end, the discharge opening of said mixer tube being positioned closely adjacent said open end of the casing, a deflector plate positioned adjacent said discharge opening and having a pivotal axis disposed transversely of said member at one side thereof, said deflector plate including a first portion adapted to restrict flow through the discharge opening and a second portion adapted to restrict flow through the open end of the casing, a rod pivotally connected to said deflector, and gas pressure responsive means for actuating the rod whereby an increase in gas pressure in said line acts to tilt the deflector toward fully open position out of the path of flow from said discharge opening.

4. A gas burner, comprising: an inner tube for passage of gas and air, said tube having an intake and discharge end; an outer tube surrounding the inner tube and defining therewith a passage for secondary air and having intake and discharge ends corresponding to the intake and discharge ends of said inner tube; a deflector plate having a portion of such area as to partially cover the discharge end of said inner tube, and a complementary portion of such area as to partially close said secondary air passage; means for pivotally supporting said defiector plate for movement between a plane traversing the axis of said tubes and wherein said passages are partially closed, and a plane substantially parallel to said axes wherein said passages are substantially unobstructed; a gas nozzle positioned to inject gas into the inlet of said inner tube and entrain primary air; means for supplying gas under pressure to said nozzle; and means responsive to variation in the pressure of the gas for pivoting said deflector plate toward said plane parallel with said axes in correspondence with increase in the pressure of the gas delivered to said nozzle, and for pivoting said deflector plate toward said traversing plane in correspondence with decrease in the pressure of gas delivered to said nozzle.

References Cited in the file of this patent UNITED STATES PATENTS 595,778 Knoop Dec. 21, 1897 1,480,146 Bradshaw Jan. 8, 1924 2,481,330 Neal Sept. 6, 1949 2,572,675 Swenson et al. Oct. 23, 1951 

